You can't because ekans isn't in blue version. You need to trade it from red.
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spell arbok backwards and it spells kobra that's what arbok is do the same with ekans and obviously you will find its a snake
Arbok sounds like cobra backwards.
The simple answer...no.
you cant you can only get it in fire red sorry go and get fire red if you want arbok
Arbok does not evolve into Seviper, it doesn't evolve after evolving out of Ekans. Hope I helped! :)